Implement BIP 118 validation (SIGHASH_ANYPREVOUT) #56
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Introduce `KeyVersion` in preparation for defining new behaviours via BIP 342's "unknown public key type" upgrade mechanism.
… was conserved This fuzz targets copied the SignatureHashSchnorr function for Bitcoin Core 23.0 and checks the output of the APO-ready SignatureHashSchnorr from this branch against it. This is to make sure the behaviour of the function was not changed for non ANYPREVOUT keys, which would make some previously valid signatures invalid and, even worse, some previously invalid signatures valid.
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Forward port from #34